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SUBTRACTION Self-Correcting Quiz - NINES

1
17
-  9
2
18
-  9
3
15
-  9
4
11
-  9
5
15
-  9
6
16
-  9
7
14
-  9
8
10
-  9
9
16
-  9
10
12
-  9
11
17
-  9
12
14
-  9
13
11
-  9
14
10
-  9
15
13
-  9
16
18
-  9
17
12
-  9
18
13
-  9
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